using System;

​

public class Program

{

    public static void Main()

    {

        var n = int.Parse(Console.ReadLine());

        var type = Console.ReadLine();

        double rs = 1;

        if (n < 20)

        {

            if (type == "day")

            {

                rs = (n * 0.79) + 0.70;

            }

​

            else if (type == "night")

            {

                rs = (n * 0.90) + 0.70;

            }

​

        }

​

        else if (n < 100)

        {

            rs = n * 0.09;

        }

​

        else

        {

            rs = n * 0.06;

        }

        Console.WriteLine(rs);

    }

}